An ignighter would work better than a detonator, nitrocellulose is't a high explosive. Actually, a weak form was used to paint model airplane wings to pull the skin tight. It's also known as single base powder for those who partake of shooting sticks, when in need of some NC lacquor with none to be found I simply dissolved some single base powder in acetone. Presto, flammible paint.

I should probably mention that I was at an ATF approved facility with my explosives license in my pocket. Do not try this at home without proper permits, wavers, personal safety equipment, $42,000,000,000 insurance, and your own bunker.